Gee, I wonder how the water levels were so low back then that they had a bridge....yet now it's called global warming when the water level goes back to where it obviously used to be..
"Lower water levels reveal medieval bridge in Spanish reservoir"
--- Reservior = man made lake typically caused by putting a dam on a river. Reduce amount of water in reservoir, water level decreases. Happens in American made reservoirs too. Nothing to do with global warming, unless rain patterns have caused the original river to dry up.